Andrew said:
Here's one example.
If you run Notepad.exe in the 64bit version you are running 64bit notepad.
There is no 32bit notepad in that version.
OK, I understand that, but AFAIK notepad is installed in both versions, both
64 and 32. If you have Win 7 64 bit version installed it will run any
program included in your Win 7 whether 64 or 32 bit. And if you don't have
a 64 bit capable machine so you install 32 bit version, then you have all
the same MS programs that come with your particular version of Win 7, and
those programs will be the same name, just 32 bit instead of 64. Now, the
only limitation I can see is if you have a 32 bit install and want to use a
64 bit program, you can't. But, are there any 64 bit ONLY programs? AFAIK
every Windows has the same amount of programs built into it whether it's 32
or 64.
So my answer to the OP was he didn't need both 32 and 64 bit versions since,
if he has a 64 bit capable machine, then he can install the 64 bit and run
any 64 bit program he chooses or 32 bit program he chooses.
Dave